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Only full sentences are used for testing and validation, though sentences and phrases are used for training. See Yoon Kim 2014, Convolutional Neural Networks for Sentence Classification for an ...
Two starting places: Do a Google Scholar search for "sentiment analysis" and read the papers from the past few years. Work through Scikit-Learn's text classification tutorial. Copy the 20 Newsgroups ...
The Stanford Sentiment Analysis dataset is based on Rotten Tomatoes reviews, has parses and sentiment annotation down to the syntactic component level.